Chousionis, Vasileios. <br/><br/>
Insrinsic lipschitz graphs and vertical b-numbers in the heisemberg / 
Vasileios Chousionis, Katrin Fassler, and Tuomas Orponen. 
 - Baltimore, Maryland U.S.;   Johns Hopkins University Press,   June 2019. 
 - volume 1087-1147. 
<br/><br/><label>Dewey Class. No.: </label>DPer 510.5 Am351 June-August vol.141 no. 3-4